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INFER_SCHEMA

Automatically detects the file metadata schema and retrieves the column definitions.

警告

infer_schema currently only supports parquet file format.

Syntax​

INFER_SCHEMA(
  LOCATION => '{ internalStage | externalStage }'
  [ PARTTERN => '<regex_pattern>']
)

Where:

internalStage​

internalStage ::= @<internal_stage_name>[/<path>]

externalStage​

externalStage ::= @<external_stage_name>[/<path>]

PATTERN = 'regex_pattern'​

A PCRE2-based regular expression pattern string, enclosed in single quotes, specifying the file names to match. Click here to see an example. For PCRE2 syntax, see http://www.pcre.org/current/doc/html/pcre2syntax.html.

Examples​

Generate a parquet file in a stage:

CREATE STAGE infer_parquet FILE_FORMAT = (TYPE = PARQUET);
COPY INTO @infer_parquet FROM (SELECT * FROM numbers(10)) FILE_FORMAT = (TYPE = PARQUET);
LIST @infer_parquet;
+-------------------------------------------------------+------+------------------------------------+-------------------------------+---------+
| name                                                  | size | md5                                | last_modified                 | creator |
+-------------------------------------------------------+------+------------------------------------+-------------------------------+---------+
| data_e0fd9cba-f45c-4c43-aa07-d6d87d134378_0_0.parquet |  258 | "7DCC9FFE04EA1F6882AED2CF9640D3D4" | 2023-02-09 05:21:52.000 +0000 | NULL    |
+-------------------------------------------------------+------+------------------------------------+-------------------------------+---------+

infer_schema​

SELECT * FROM INFER_SCHEMA(location => '@infer_parquet/data_e0fd9cba-f45c-4c43-aa07-d6d87d134378_0_0.parquet');
+-------------+-----------------+----------+----------+
| column_name | type            | nullable | order_id |
+-------------+-----------------+----------+----------+
| number      | BIGINT UNSIGNED |        0 |        0 |
+-------------+-----------------+----------+----------+

infer_schema with Pattern Matching​

SELECT * FROM infer_schema(location => '@infer_parquet/', pattern => '.*parquet');
+-------------+-----------------+----------+----------+
| column_name | type            | nullable | order_id |
+-------------+-----------------+----------+----------+
| number      | BIGINT UNSIGNED |        0 |        0 |
+-------------+-----------------+----------+----------+